Dynamo-electric machine.



No. 849,085. PATENTED APR. 2, 1907.

E. ROSENBERG. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED AUG. 1 1904.

\ \'ITl !ESSES= EINVENTOR:

? Emanuel Roienloer g,

' I Lay UNITED sTAT s PATENT OFFICE.

EMANUEL ROSENBERG, OF BERLIN, EhIItIITXNY, ASSIGNOR T GENERAL ELEOTRIOCOMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTRIC MACHINE.

NO. 849,085. Specification of Letters Patent.

Patented April 2, 1907. Application filed August 1, 1904- Serial No-219,022.

To all whom it may concern: I

Be it known that I, EMANUEL ROSENBERG, a subject of the Emperor ofAustria, residing at Berlin, Germany, have invented certain new anduseful Improvements in Dynamo- Electric Machines, of which the followingis a specification.

ln those dynamo-electric machines in which current is fed thereby to amultipleconductor systemsuch, for example, as a three-wire 'system it isc0mmon to cause the series winding to be traversed by the currents ofthe outside mains of the system. For this purpose a divided serieswinding is provided, one 'portion of which is in series with one outsidemain and the other in series with the other outside main. Thisconstruction is open to certain disadvantages. Thus, for example, if itbe desired to operate the machine in multiple with an ordinarycompoundwound machine it is necessary in order to make the properconnection of the equalizing" conductors by which the said windings areplaced in parallel circuit to connect the series windings of bothmachines to the same outside conductor of the system.

My resent invention makes it possible to leave t e main or serieswindings unchanged in one of the outside leads and to secure at the sametime the proper regulation to take care of unbalanced loads on the twosides of the system. In accordance with my invention I connect the mainseries winding on the machine in one only of the outside leads and inaddition provide a supplementary winding in series with the neutralconductor of the system. This supplementary winding, if it is desired toObtain the same compounding effect as by the use of two series windings,is provided with half the number of turns of the main winding and is putin circuit so as to magnetize in the same direction as this winding,assuming the Winding in each case to be traversed by currents flowing inthe same direction relatively to the machine. The cross-section ischosen in accordance with the current which is expected to flow at timesin the neutral conductor.

The novel features which are character istic of my invention I havepointed out with particularity in the appended claims. The inventionitself, however, will be better understood by reference to thefollowingdescription, taken in connection with the accompanying drawings, inwhich Figure 1 is a diagrammatic representation of a dynamo-electricmachine of a type to which my invention is applicable, while Fig. 2shows my invention as applied to such a machine.

The machines to which my invention is applicable may be of various formsand types so long as they are characterized by connection to amultiple-conductor system and require for their proper o eration the useof regulating or compoun windings. 1 Fig. 1 is intended as illustrativeof a machine of this character. The armature and commutator of themachine are indicated at 1. The main brushes bearing upon the commutatorare shown at 2 and 3 and are connected, respectively, to series orcompound windings 4 and 5. These windings are connected to the outsidemains 6 and 7 of a three-wire distribution system. The neutral conductor8 of the system is connected to some point of neutral potential withrespect to the generator or machine 1. In the present instance thisneutral point is provided by means of a third or auxiliary brush 9,located on the commutator midway between the brushes 2 and 3. Any otherwell-known way, however, of obtaining a neutral for connection to theconductor 8 may be employed without departing from my invention.

The splitting up of the compounding winding into two series coils 4 and5, as shown in Fig. 1, is at times inconvenient for reasons abovementioned. To Overcome this objection and at the same time produce thesame regulating action in the machines, I have provided an organizationas shown in Fig. 2. In this figure a single series winding 10 having thesame total number of turns as the individual windin s 4 5 is providedand is connected in one 01 the outside leads 11 of the machinecorresponding to the lead 6 in Fig. 1. This winding is connected to thebrush 12, corresponding to the brush 2 in Fig. 2. In series with theneutralconductor 13, which corresponds to ,conductor 8 in Fig. 1, isconnected a coil 14, havin half the number of turns of the coil 10. T eremaining or outside conductor 15 of the system is left without aregulating-winding.

The Organization shown in Fig. 2 has the Where the regulating-winding inthe outside mains is split up as in this latter figure. Vln

N Fig. 1 the ampere-turns where is the number of turns .of each windingand G and C the currents are N01 NOW- f "2' In Fig. 2 the equation is Ns .NG1x NC:

and is thus the same as for Fig. 1.

it will be evident that when the two sides of the three-wire system areequally loaded there will be no current flouting in the winds in; 14',while when a (li'll'ereuce of load occurs this winding will be trarersedby a current equal in value to the di'llereuce between the currents inthe two outside mains 1] and 15. i In other words, the winding 14 istraversed by current which is the algebraic sum of the l currents in theoutsidemains. l

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The combination of a three-wire dynam0-electric machine having a mainWinding connected to one of the outside'mains of the system, and anauxiliary winding traversed by current flowing in the neutral conductorof the system, I

2. In a dynamo-electric machine connected to a three-wire system, aregulating-winding connected to one of the outside conductors of saidsystem, and an auxiliary winding of half the number of turns connectedto the neutral conductor of the system.

.23. A (lYlltLlilO-GlGOtIiC machine, a multiple conductor systemconnected thereto, a winding on said machine connected to one oi theoutside conductors of said system, and an auxiliary winding on saidmachine connected to an intermediate conductor of said system.

In witness whereof I have hereunto set my hand this 18th day of July,1904.

EMANUEL ROSENBERG.

\Vitnesses HENRY HAsPEn, MAX HANDKE.

